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December 20, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Post a New Question | Current Questions

Chemistry / help
An equal mass of which of the following states of matter could completely fill both a 100 mL or 500 ml container? A. Gas B. Liquid C. Mixture D. Solid
Thursday, July 31, 2014 at 7:57pm

chemistry
a) Calculate the percent ionization of 0.125M lactic acid (Ka=1.4x10^-4) b) Calculate the percent ionization of 0.125M lactic acid in a solution containing 0.00075 M sodium lactate.
Thursday, July 31, 2014 at 12:23pm

Chemistry
Calculate PH of 0.05 M solution of ammonium acetate
Thursday, July 31, 2014 at 5:22am

CHEMISTRY
A mixture of methane and helium is placed in a 2.0 l flask at 27 degrees the partial pressure of methane is 0.72 ATM and the partial pressure of helium is 0.22 ATM . What is the mole fraction of ch4?
Wednesday, July 30, 2014 at 9:48pm

Chemistry
In order to make 500.0mL of a 1.835 M MgCl2 solution, then _______g of MgCl2 is needed. Moles of MgCl2= (1.835M)(0.5L)=0.9175mol Molecular Weight of MgCl2= 95.211 g/mol (0.9175mol MgCl2)(95.211 g/mol)= 87.36g of MgCl2 Did I do this correct?
Wednesday, July 30, 2014 at 7:59pm

chemistry
A sample of nitrogen gas has the temperature drop from 250°C to 150°C at constant pressure. What is the final volume if the initial volume is 310 mL?
Wednesday, July 30, 2014 at 7:50pm

inorganic chemistry
A large number of hydrogen atoms have electrons to the n=4 state.How many possible spectral lines can appear in the emission spectrum as a result of the electron reaching the ground state(n1=1).Diagram all possible pathways for de excitation from nh=4 to nh=1
Wednesday, July 30, 2014 at 7:28pm

chemistry
Which statement is false? The average kinetic energies of molecules from samples of different “ideal” gases is the same at the same temperature. Molecules of a gas undergo many collisions with each other and the container walls. All molecules of an ideal gas have the...
Wednesday, July 30, 2014 at 7:00pm

Chemistry
1. In order to make 250mL of a 0.100 M HNO3 solution from a 15.9 M stock solution, then _____mL if the 15.9 M stock HNO3 solution is needed. M1V2=M2V2, solve for V2. (0.100M * 250mL)/ 15.9M = 1.6mL V2-V1=V 1.6mL-250= -248.4 Did I do this correctly?
Wednesday, July 30, 2014 at 6:15pm

chemistry
consider the reaction 2NaF if you begin with 4.8 mol S and 2.6 mole F, what is the limiting reactant and theorical yield of NaF in moles
Wednesday, July 30, 2014 at 10:57am

Chemistry
how would you prepare 250 mL of 0.69M Al2(SO4)3 solution from a 2.0M Al2(SO4)3 stock solution?
Wednesday, July 30, 2014 at 10:21am

Chemistry
DECOMPOSITION OF NO2 (10/10 points) The decomposition of NO2 at room temperature exhibits the following variation in concentration with time: The concentration of NO2 is expressed in mol/liter, while time is expressed in seconds. [NO2] ln[NO2] 1/[NO2] Time (s) 0.0831 -2.4877 ...
Wednesday, July 30, 2014 at 9:57am

Chemistry
If the sign for delta G is negative (spontaneous process) and sign for delta S is positive (more disorder) for both dissolving processes, how could one be endothermic (positive delta H- NaNO3 dissolves in water) and one be exothermic (negative delta H- NaCH3COO dissolves in ...
Wednesday, July 30, 2014 at 2:23am

Chemistry
Using Hess’s Law with the following data: N2(g) + O2(g) = 2NO(g) Del(H) = 180.7kj 2NO(g) + O2(g) = 2NO2(g) Del(H)= -113.1kj 2N2O(g) = 2N2(g)+ O2(g) Del(H)=-163.2kj Calculate Del(H) for the reaction: N2O(g) + NO2(g) = 3NO(g)
Tuesday, July 29, 2014 at 11:22pm

Chemistry
Calculate the standard enthalpy change for the following reaction at 25 °C.? 2CH3 OH(g) + 3O2(g) -------- 2CO2(g) + 4H2O (g)
Tuesday, July 29, 2014 at 7:42pm

chemistry
You have a 1.0 M stock solution of H2SO4 in a large flask. You need to dilute this to make a 0.25M solution of H2SO4 for an experiment. If you need exactly 100.0mL of the diluted solution, how would you make the diluted solution?
Tuesday, July 29, 2014 at 3:08pm

Writing
Please give me a score of 1-6 (one being poor and six being excellent). Also, please give me some feedback! Thank you in advance! Essay prompt: What motivates people to change? Essay: Many people know that eating junk food is unhealthy. Yet, they keep eating it because it ...
Tuesday, July 29, 2014 at 1:14pm

Chemistry
how would you prepare 250 ml of 0.69m al2(so4)3 solution from a 2.0 al2(so4)3 stock solution
Tuesday, July 29, 2014 at 11:34am

Chemistry
A 30.00 mL sample of 0.1500 M hydroazoic acid (HN3; Ka = 1.9 x 10-5) is titrated with 0.1000 M KOH. Calculate the pH after the following volumes have been added: a. 0.00 mL b. 11.25 mL c. 22.50 mL d. 33.75 mL e. 45.00 mL f. 56.25 mL
Tuesday, July 29, 2014 at 10:35am

Chemistry
According to the experiment procedure, given that the NaOH solution has a concentration of 0.100M, and that the vinegar (acetic acid) has a concentration of 5.0%m/m (mass percent), what volume(mL) of titrant would be required to reach the "equivalence point", if you ...
Tuesday, July 29, 2014 at 8:09am

SAT WRITING
Please give me a score of 1-6 (one being poor and six being excellent). Also, please give me some feedback! Thank you in advance! Essay prompt: What motivates people to change? Essay: Many people know that eating junk food is unhealthy. Yet, they keep eating it because it ...
Tuesday, July 29, 2014 at 12:42am

Chemistry
Will the following reactions mixed together cause a precipitate reaction, released gas reaction, or no reaction. Ba(NO3)2 mixed with NaCl Ba(NO3)2 mixed with HCl Ba(NO3)2 mixed with Na2CO3 Ba(NO3)2 mixed withNa3SO4 also Ba(NO3)2 is soluble and a solid and HCl is a gas. Is ...
Monday, July 28, 2014 at 11:12pm

chemistry
what mass of water must react with calcium carbide for 3.9g of acetylene gas to form?
Monday, July 28, 2014 at 10:40pm

SAT Writing
Please give me a score of 1-6 (one being poor and six being excellent). Also, please give me some feedback! Thank you in advance! Essay prompt: What motivates people to change? Essay: Many people know that eating junk food is unhealthy. Yet, they keep eating it because it ...
Monday, July 28, 2014 at 9:20pm

chemistry
The half live of Iodine-131 is 8 days. if you started out with 40 mg sample of iodine-131, then what would be the mass of the sample after 32 days? please show your work
Monday, July 28, 2014 at 6:30pm

Chemistry
Orange juice clams that 200ml of their product contains 2.5 times the average daily allowance of Vitamin C. Calculate the average daily allowance of vitamin c (in mg) if the orange juice contains 0.040% (w/v) of vitamin C.
Monday, July 28, 2014 at 6:05pm

Chemistry
Calculate the maximun=m mass of ethanol that can be made from 5.6 tonnes of ethen
Monday, July 28, 2014 at 4:21pm

CHEMISTRY (IODINE VALUE-continuation)
y question is about Determination of Iodine Value in Fats & Oils experiment. I can't seem to get the right IV for coconut oil (Iv = 7-11 range). I followed the procedure used by American Oil Chemists Society, but still I'm getting an IV value of around 1. The volume of...
Monday, July 28, 2014 at 2:51pm

organic chemistry
What is the complete reaction mechanism for the reaction between butanone and methylamine (CH3NH2) with the reaction buffered at a pH of 3.5 and heated.
Monday, July 28, 2014 at 2:21pm

chemistry
Potassium 2:5 Chloride solution 30ml. How many milliliters of a potassium chloride 3:5 solution do you need to prepare the order?
Monday, July 28, 2014 at 12:51pm

Chemistry
100g of a saturated solution of KNO3 was cooled from 80 degrees to 50 degrees. What mass of KNO3 would be expected to crystallise out of the solution?
Monday, July 28, 2014 at 7:11am

CHEMISTRY
how to predict that given complex is sp3 dsp2 hybridized because in Mcqs they ask to identify hybridization in given compound
Monday, July 28, 2014 at 4:36am

Chemistry
How many liters of nitrogen oxide at STP are produced from the reaction of 59.g of NH3? Balanced Equation: Ammonia reacts with oxygen to produce nitrogen oxide and water. 4NH3(g)+5O2(g)→4NO(g)+6H2O(g)
Monday, July 28, 2014 at 1:07am

chemistry
A 52.3 kg sample of ethanol is needed for a reaction. What volume in liters of ethanol should be used? The density of ethanol is 0.789 g/mL
Sunday, July 27, 2014 at 8:27pm

Chemistry
Consider the data below Temperature(0C) Diffusivity(m2/s) 736 2 x 10-13 782 5 x 10-13 835 1.3 x 10-12 Given this data, determine the activation energy for the diffusion process (units of Joules per atom or molecule) in this material and the pre-exponential factor (use units of...
Sunday, July 27, 2014 at 6:19pm

chemistry
1-Dinitrogen tetroxide (N2O4) dissociates according to the equation: N2O4 ⇌ 2NO2 An equilibrium reaction mixture at 25 ºC was found to have the partial pressure of N2O4 as 72 kPa whilst the partial pressure of nitrogen dioxide (NO2) was 29 kPa. Calculate Kp for the ...
Sunday, July 27, 2014 at 5:38pm

Chemistry
When normal atmospheric conditions are present, water is constantly being cycled between liquid and gaseous states by which of the following pairs of processes? A. Turgor pressure and filtration B. Melting point and condensation C. Evaporation and condensation D. Filtration ...
Sunday, July 27, 2014 at 4:56pm

Chemistry
Why would you subtract the heat of a calorimeter when calculating heat of the reaction? hint: the heat of the calorimeter is the amount of heat that the calorimeter absorbs from the solution-each calorimeter will absorb a certain amount of heat, which means that the ...
Sunday, July 27, 2014 at 4:51pm

chemistry check answer
Question: Explain whether using solid NaOH pellets rather than aqueous NaOH would alter the enthalpy. If different, would it be higher or lower My answer: Would the result be different since the aqueous NaOH would be able to quickly dissolve in water unlike solid NaOH which ...
Sunday, July 27, 2014 at 4:51pm

Chemistry
Consider the data below Temperature (0C) Diffusivity (m2/s) 736 2 x 10-13 782 5 x 10-13 835 1.3 x 10-12 Given this data, determine the activation energy for the diffusion process (units of Joules per atom or molecule) in this material and the pre-exponential factor (use units ...
Sunday, July 27, 2014 at 4:15pm

chemistry
Sodium metal is immersed into graduated cylinder that holds exactly 32.5 ml. The sodium metal used to fill the cylinder weighs 405.5 grams. Calculate the density of sodium based on the given data.
Sunday, July 27, 2014 at 10:35am

chemistry
A sol n contains 37g cuso4 and 111g water . Calculate the concentration by mass /c of sol n.
Sunday, July 27, 2014 at 8:46am

chemistry
Ammonium nitrate is used in explosives and is produced from the reaction of ammonia and nitric acid. If 15 kg of ammonia give an actual yield of 65.3 kg of ammonium nitrate, what is the percent yield? The calculated yield of ammonium nitrate for the experiment is 70.6kg.
Sunday, July 27, 2014 at 4:50am

chemistry
a.Given the equation: 2CaCO3 + 2SO2 + O2 -> 2CaSO4 + 2CO2 What is the actual yield of CO2 if 7.5 mol of O2 gives a percent yield of 80%? b. The pollutant sulfur dioxide can be removed from the emissions of an industrial plant by the reaction with calcium carbonate and ...
Sunday, July 27, 2014 at 4:47am

chemistry
A student used 3.27g of Zn to react with excess HCl and obtains 6.47g ZnCl2. What is the percent yield?
Sunday, July 27, 2014 at 4:37am

Chemistry
A 0.60 g sample consisting of only CaC2O4 & MgC2O4 is heated at 5000C, converting the two salts of CaCO3 and MgCO3 . The sample then weighs 0.465 g. If the sample had been heated to 9000C, where the products are CaO & MgO, what would the mixtures of oxides have weighed? a) 0....
Saturday, July 26, 2014 at 11:42pm

CHEMISTRY
how to predict that given complex is sp3 dsp2 hybridized because in Mcqs they ask to identify hybridization in given compound
Saturday, July 26, 2014 at 9:08pm

CHEMISTRY
how to predict that given complex is sp3 dsp2 hybridized
Saturday, July 26, 2014 at 7:37pm

chemistry
A silicon ribbon measuring 100 micron thick, 5 mm wide, and 1 m long has 5 volts applied across its long dimension. The resistivity of silicon is 640 ohm-m. How much current will flow through the ribbon? Express your answer in Amps
Saturday, July 26, 2014 at 7:07pm

chemistry
ph of 6.10mL of 1.20M HCl diluted to 0.560L .
Saturday, July 26, 2014 at 4:35pm

Chemistry
1 mole of equimolar mixture of ferric oxalate and ferrous oxalate will require xmole of KMnO4 in acidic medium for complete oxidation, x isis: a) 0.5 mole b) 0.9 mole c) 1.2 mole d) 4.5 mole
Saturday, July 26, 2014 at 2:49pm

Chemistry
A metal M forms the sulphate M2(SO4)3 . A 0.596 gram sample of the sulphate reacts with excess BaCl2 to give 1.220 g BaSO4. What is the atomic weight of M? (Atomic weights : S = 32, Ba = 137.3)
Saturday, July 26, 2014 at 2:48pm

Chemistry
Nitric acid can be produced from NH3 in three steps process: I)4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g) II)2NO(g) + O2(g) → 2NO2(g) III)3NO2(g) + H2O(l) →2HNO3(aq) + NO(g) % yield of Ist, IInd & IIIrd are respectively 50 % , 60 % & 80 % respectively the what ...
Saturday, July 26, 2014 at 2:44pm

chemistry
1. What is the binding energy per nucleon? Why is the binding energy per nucleon, rather than per nuclide, used to compare nuclide stability? 2. When a nucleus forms from nucleons, is energy absorbed or released? Why? 3. Many scientists reacted skeptically to Einstein's ...
Saturday, July 26, 2014 at 2:30pm

College English
John Winthrop “A Model of Christian Charity" Discuss the manner in which the theories expressed by Winthrop are in some degree evident in American government and culture today. CAN SOMEONE TELL ME IF I ANSWER IT RIGHT? In Prospero's America, Walter W. Woodward ...
Saturday, July 26, 2014 at 12:45pm

Chemistry Help
1. Spectroscopic studies of the reaction of azide ion with the cluster [Ru3(CO)12] in acetone solvent confirmed the occurrence of process (i) under a CO atmosphere. Kinetic measurements of this rapid [Ru3(CO)12]+ N3– →[Ru3(NCO)(CO)11]–+ N2(i) reaction revealed ...
Saturday, July 26, 2014 at 12:36pm

Chemistry
Suppose 26.0g of sodium bromide is dissolved in 150mL of a 0.60M aqueous solution of silver nitrate. Calculate the final molarity of bromide anion in the solution. You can assume the volume of the solution doesn't change when the sodium bromide is dissolved in it.
Saturday, July 26, 2014 at 7:10am

Chemistry
Calculate the number of millilitres of NH3(aq) solution (d = 0.986 g/ mL) contain 2.5 % by weight NH3 which will be required to precipitate iron as Fe(OH)3 in a 0.8 g sample that contains 50 % Fe2O3.
Saturday, July 26, 2014 at 7:05am

chemistry
*This is part of an exam. so please don't give full solution* just trying to bump ahead of a block. The decomposition of NO2 at room temperature exhibits the following variation in concentration with time: The concentration of NO2 is expressed in mol/liter, while time is ...
Saturday, July 26, 2014 at 12:00am

college English
Discuss the manner in which the theories expressed by John Winthrop are in some degree evident in American government and culture today. Can someone tell if my answer is right. In Prospero's America, Walter W. Woodward looks at the exchange of catalytic society to America ...
Friday, July 25, 2014 at 8:42pm

English
Discuss the manner in which the theories expressed by John Winthrop are in some degree evident in American government and culture today. Can someone tell if my answer is right. In Prospero's America, Walter W. Woodward looks at the exchange of catalytic society to America ...
Friday, July 25, 2014 at 7:31pm

Chemistry
Hydrogen Storage in Alloys - The Future? Certain alloys such as LaNi5 can store hydrogen at room temperature. A plate of LaNi5 containing no hydrogen is placed in a chamber filled with pure hydrogen and maintained at a constant pressure. At what depth from the surface will the...
Friday, July 25, 2014 at 6:10pm

Chemistry Please Help!!!
Airbags contain a mixture of sodium azide, potassium nitrate, and silicon dioxide. A sensor detects a head on collision that cause the sodium azide to be ignited and to decompose forming sodium and nitrogen gas. This gas fills a nylon or polyamide bag such that the front face ...
Friday, July 25, 2014 at 12:55pm

chemistry
What volumr 0.250 mol/L hydrochloric acid is neutralized by 1.50g of calcium hydroxide?
Friday, July 25, 2014 at 3:28am

Chemistry
2Mg + O2 --> 2MgO REMEMBER our mole ratio is 2Mg:1O2, 2Mg:2MgO, 1O2:2MgO So if we had 3Mg how much O2? (3Mg)(1O2/2Mg) = 1.5O2 How much MgO could be produced from 3O2?
Thursday, July 24, 2014 at 7:06pm

chemistry
How many milliliters of a 0.100 M NaOH solution are required to neutralize 25.0 milliliters of 0.150 M HCl? Select one: a. 25.0 ml b. 37.5 ml c. 125 ml d. 167 ml
Thursday, July 24, 2014 at 12:55pm

chemistry
what mass of the following compounds will dissolve in 200g of water at 30 degrees Celsius a) CuSO45H2O b) KNO3 c) NaNO3 how do a work it out, thanks
Thursday, July 24, 2014 at 8:21am

Chemistry
Which of the following is true regarding the structure of atoms? A. The amount of charge on a proton is greater than the amount of charge on an electron. B. Isotopes of an element differ in the number of protons in the nucleus. C. The mass of each electron is the same as the ...
Thursday, July 24, 2014 at 12:09am

Chemistry
A 11.0-mL sample of an unknown H3PO4 solution requires 116mL of 0.140 KOH to completely react with the H3PO4. What was the concentration of the unknown H3PO4 solution (answer in M). H3PO4(aq) + 3KOH(aq) --> 3H2O(l) + K3PO4(aq)
Wednesday, July 23, 2014 at 9:38pm

chemistry
If a reaction has rate constant of 1.33 s^-1 at 206 deg C and an activation energy of 58.6 kj mol^-1. whats the rate constant at 358 deg C ?
Wednesday, July 23, 2014 at 8:36pm

chemistry
Hello, Please help me with this question! Which dilution would turn 10% (by mass) HCl solution into 0.100 M HCl solution? Density of 10% HCL = 1.08 g ml^-1
Wednesday, July 23, 2014 at 6:14pm

Chemistry
Hello, I would greatly appreciate some help with the following problem, as I'm not sure how to proceed. I'm trying to find solubility (Ksp) of Cu(IO3)2 from titration experiment. The following equations were provided: Cu(IO3)2 --> Cu^2+ + 2IO3^- Ksp = [Cu^2+][IO3...
Wednesday, July 23, 2014 at 6:11pm

physical chemistry
when two liquid A and B mixed cooling occurs. why?
Wednesday, July 23, 2014 at 12:18am

Chemistry
Consider the unbalanced redox reaction: Cr2 O7 2-(aq) + Cu(s) ----> Cr3+(aq) + Cu2+ Balance the equation in acidic solution and determine how much of a 0.850 M K2 Cr2 O7 solution is required to completely dissolve 5.25 g of Cu.
Tuesday, July 22, 2014 at 11:27pm

Chemistry
Why would you subtract the heat capacity of the calorimeter when calculating the heat of the reaction?
Tuesday, July 22, 2014 at 8:19pm

Chemistry
For the equation q=cΔt, q=100KJ, initial temp=20 degrees celsius, final temp=31.4 degrees celsius and I need to find c. Do I need to convert the q value from KJ to J?
Tuesday, July 22, 2014 at 6:03pm

chemistry
What mass of cesium chloride must be added to 0.570 L water to produce a 0.375 m solution?
Tuesday, July 22, 2014 at 12:46pm

CHEMISTRY (PLEASE HELP)
My question is about Determination of Iodine Value in Fats & Oils experiment. I can't seem to get the right IV for coconut oil (Iv = 7-11 range). I followed the procedure used by American Oil Chemists Society, but still I'm getting an IV value of around 1. The volume ...
Tuesday, July 22, 2014 at 9:13am

chemistry
250 gms of Zn (65.5) gave 242 gms of ZnO on ignition. Calculate %age yield of the reaction.
Tuesday, July 22, 2014 at 5:37am

chemistry
Calculate the pH of a solution formed by the addition of 25.00 g of sodium acetate, NaC2H3O2 , to 450 mL of a 0.210 M solution of acetic acid, HC2H3O2
Monday, July 21, 2014 at 10:09pm

chemistry
Potassium Chloride 3:4 solution 30ml. How many milliliters of a potassium 1:20 solution and 4:5 solution do you need to prepare the order?
Monday, July 21, 2014 at 9:35pm

chemistry
In what proportion should you combine a 2:5 soaking solution and distilled water to create a 300 ml of a 1:20 solution?
Monday, July 21, 2014 at 8:38pm

chemistry
In what proportion should you combine a 2:5 soaking solution and distilled water to create a 300 ml of a 1:20 solution?
Monday, July 21, 2014 at 7:09pm

chemistry
In what proportion should you combine a 2:5 soaking solution and distilled water to create a 300 ml of a 1:20 solution
Monday, July 21, 2014 at 6:39pm

chemistry
When using a 1% cream and a 6% cream to produce a 4% cream, how many parts of each initial ingredient will be needed?
Monday, July 21, 2014 at 6:33pm

Chemistry
For an enthalpy lab, why would calculated value differ from the theoretical value (in percent error) for the heat reaction of Mg/HCl and MgO/HCl
Monday, July 21, 2014 at 4:42pm

Chemistry
Calculate the concentrations of all species in a 1.17 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4× 10–2 and Ka2 = 6.3× 10–8. I found Na+ = 2.34 SO3^2- = 1.17 H2SO3 = 7.14 x10^-13 I can't find HSO3...
Monday, July 21, 2014 at 2:10pm

Chemistry
Find the enthalpy of combustion of magnesium using Hess' law given the following data (assume that exactly 100.0 mL of HCl was used in each trial and that HCl is in excess) Magnesium/HCl reaction: Grams of Mg= 0.244g Initial temp= 32.2 degrees celsius Final temp= 21.3 ...
Monday, July 21, 2014 at 2:06pm

chemistry
When you take a block of butter out of the fridge,it is hard.However,after 15 minutes at room temperature it is soft enough to spread
Monday, July 21, 2014 at 2:00pm

Chemistry
Phosphoric acid, H3PO4(aq), is a triprotic acid, meaning that one molecule of the acid has three acidic protons. Estimate the pH, and the concentrations of all species in a 0.200 M phosphoric acid solution. pKa1 = 2.16 pKa2 = 7.21 pKa3 = 12.32 Ok I haven't been able to ...
Monday, July 21, 2014 at 1:48pm

chemistry 185
how are you going to prepare the follwoing phosphate solution which is used in many cell culture medium? 12 liters ;PH 7.4; 0.9%WT (total salts weight is 9.00 grams in one liter) How many grams of what acid? how many grams of the conjugate base?
Monday, July 21, 2014 at 12:22pm

chemistry
Which one of the following is a characteristic of a metal? A. Reacts with bases to produce salts B. Changes the color of litmus paper to red C. Becomes negative when combined with other elements D. Conducts heat readily
Monday, July 21, 2014 at 10:15am

Chemistry
why can't the enthalpy of magnesium be measured using a coffee cup calorimeter?
Monday, July 21, 2014 at 1:25am

Chemistry
What is meant by 0.2mol (12g) of glacial acetic acid how can we make ?
Monday, July 21, 2014 at 12:42am

Honors Chemistry
If 72.4 kJ of heat is supplied to a 752 g block of metal, the temperature of the metal increases by 9.95°C. Calculate the specific heat capacity of the metal in J/g·°C. I cannot find the information in my textbook, and I don't understand the equation needed ...
Monday, July 21, 2014 at 12:26am

chemistry
It is ok to have a negative percent error? I got a negative value for the percent error of the enthalpy of the formation of methane gas
Sunday, July 20, 2014 at 10:25pm

Chemistry
The combustion reaction of Mg +1/2 O2-->MgO produces a very bright white flame and high heat. Verify that the following reactions produce the same overall reaction: a) MgO+2HCl-->MgCl2+H2O b) Mg+2HCl-->MgCl2+H2 c) H2+1/2O2-->H2O ΔH°= -285.8 KJ/mol
Sunday, July 20, 2014 at 10:19pm

chemistry
a. Determine the density of a cube of copper with a length of 5.00 cm and a mass of 1,112.50 g. b. Calculate the number of atoms in the cube
Sunday, July 20, 2014 at 6:20pm

Chemistry
I am to use this formula to find ΔH°f,methane: ΔH°comb=2ΔH°f,water+&#​916;H°f, carbon dioxide-ΔH°f,methane-2ΔH&d​eg;f,oxygen For ΔH°comb, the value is 884 KJ/mol For ΔH°f,water, the value is -285.8 For...
Sunday, July 20, 2014 at 5:13pm

Chemistry
A calorimeter is filled with 10.0 millimole (mmole) of methane gas and an excess of oxygen. When burned, the ignition wire releases 140.77 J of heat. The heat capacity of the calorimeter is 4.319 KJ°C-1. qwire= 140.77 J Calculate ΔHcomb. Recall that ideal gas law is ...
Sunday, July 20, 2014 at 2:01pm

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